# if 5>8:
#     print("5 is greater than 8")
#     print("523")
# else:
#     print("5 is less than 8")
#
# age = 30
# if age < 18:
#     print("you are underaged")
# elif age >= 18 and age < 30:
#     print("you are young")
# elif age >= 30 and age < 50:
#     print("You are middle-aged")
# else:
#     print("You are old")

#判断闰年
# year = int(input("请输入年份："))
# if (year % 4 ==0 and year % 100 != 0) or (year % 400 == 0):
#     print("%d是闰年"%year)
# else:
#     print("%d不是闰年"%year)

#a b c 比较大小
# a = int(input("请输入a："))
# b = int(input("请输入b："))
# c = int(input("请输入c："))
# if a>b:
#     if a>c:
#         print("a is the largest")
#     else:
#         print("c is the largest")
# else:
#     if b > c:
#         print("b is the largest")
#     else:
#         print("c is the largest")
#
# #计算器实现加减乘除
# num1 = float(input("请输入第一个数字："))
# num2 = float(input("请输入第二个数字："))
# op = input("请输入运算符：")
# if op =="+":
#     print(num1+num2)
# elif op =="-":
#     print(num1-num2)
# elif op =="*":
#     print(num1*num2)
# elif op =="/":
#     print(num1/num2)
# else:
#     print("输入错误")
